US 2026/0269763 A1Published application

Active capability management of multiphase permanent magnet dc motor drives

OwnerPrathima Nuli, Prerit Pramod +1inventors

InventorsPrathima Nuli, Prerit Pramod, Krishna MPK Namburi

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Abstract

A method of controlling a dual winding permanent magnet direct current (DW-PMDC) machine includes: determining, based on an initial torque command, a positive machine current; determining, based on the positive machine current, a positive machine voltage; determining, based on first and second DC supply voltages supplied to first and second power converters, a positive machine lower voltage limit; determining, based on the positive machine voltage and the positive machine lower voltage limit, a negative machine voltage; determining, based on the negative machine voltage, a negative machine current; determining, by applying a mathematical transformation to the positive and negative machine current, first and second final current commands; and commanding each of the first and second power converters to apply a DC output voltage to corresponding winding sets of the DW-PMDC machine to cause output currents to be generated in the winding sets in accordance with the corresponding final current commands.

Claims20

Dependent claims

A method of controlling a dual winding permanent magnet direct current (DW-PMDC) machine having a first winding set and a second winding set, the method comprising:

determining, based on an initial torque command
(
T
e
*
)
,
a positive virtual machine current (Ip);
determining, based on the positive virtual machine current (Ip), a positive virtual machine voltage (Vp);
determining, based on a first DC supply voltage (Vdc1) of a power supply to a first power converter and a second DC supply voltage (Vdc2) of a power supply to a second power converter, a positive virtual machine lower voltage limit (Vpl);
determining, based on the positive virtual machine voltage (Vp) and the positive virtual machine lower voltage limit (Vpl), a negative virtual machine voltage (Vn);
determining, based on the negative virtual machine voltage (Vn), a negative virtual machine current (In);
determining, by applying a mathematical transformation to a set of the positive virtual machine current (Ip) and the negative virtual machine current (In), a first final current command
(
I
1
*
)
and a second final current command
(
I
2
*
)
;
commanding, based on the first final current command
(
I
1
*
)
,
the first power converter to apply a first DC output voltage to the first winding set and thereby causing a first output current to be generated in the first winding set in accordance with the first final current command
(
I
1
*
)
and
commanding, based on the second final current command
(
I
2
*
)
,
the second power converter to apply a second DC output voltage to the second winding set and thereby causing a second output current to be generated in the second winding set in accordance with the second final current command
(
I
2
*
)
.

50 more elements

A method of controlling a dual winding permanent magnet direct current (DW-PMDC) machine having a first winding set and a second winding set, the method comprising:

determining, based on a first DC supply voltage (Vdc1) of a power supply to a first power converter and a second DC supply voltage (Vdc2) of a power supply to a second power converter, a positive virtual machine upper voltage limit (Vpu);
determining, based on the positive virtual machine upper voltage limit (Vpu), a torque capability (Tcap+, Tcap−) of the DW-PMDC machine;
determining based on an initial torque command
(
T
e
*
)
and in accordance with the torque capability (Tcap+, Tcap−) of the DW-PMDC machine, a limited torque command
(
T
lim
*
)
;
determining, based on the limited torque command
(
T
lim
*
)
,
a positive virtual machine current (Ip);
determining, based on the positive virtual machine current (Ip), a positive virtual machine voltage (Vp);
determining, based on the positive virtual machine voltage (Vp), a negative virtual machine voltage (Vn);
determining, based on the negative virtual machine voltage (Vn), a negative virtual machine current (In);
determining, by applying a mathematical transformation to a set of the positive virtual machine current (Ip) and the negative virtual machine current (In), a first final current command
(
I
1
*
)
and a second final current command (I2*);
commanding, based on the first final current command
(
I
1
*
)
,
the first power converter to apply a first DC output voltage to the first winding set and thereby causing a first output current to be generated in the first winding set in accordance with the first final current command
(
I
1
*
)
;
and
commanding, based on the second final current command
(
I
2
*
)
,
the second power converter to apply a second DC output voltage to the second winding set and thereby causing a second output current to be generated in the second winding set in accordance with the second final current command
(
I
2
*
)
.

59 more elements

A system for controlling a dual winding permanent magnet direct current (DW-PMDC) machine having a first winding set and a second winding set, the system comprising:

a first power converter configured to selectively conduct current from a first DC voltage source having a first DC supply voltage, and to thereby apply a first DC output voltage to the first winding set of the DW-PMDC machine;
a second power converter configured to selectively conduct current from a second DC voltage source having a second DC supply voltage, and to thereby apply a second DC output voltage to the second winding set of the DW-PMDC machine;
and
a controller configured to:
determine, based on an initial torque command
(
T
e
*
)
,
a positive virtual machine current (Ip);
determine a positive virtual machine voltage (Vp) based on the positive virtual machine current (Ip);
determine, based on a first DC supply voltage (Vdc1) and a second DC supply voltage (Vdc2), a positive virtual machine lower voltage limit (Vpl);
determine, based on the positive virtual machine voltage (Vp) and the positive virtual machine lower voltage limit (Vpl), a negative virtual machine voltage (Vn);
determine, based on the negative virtual machine voltage (Vn), a negative virtual machine current (In);
determine, by applying a mathematical transformation to a set of the positive virtual machine current (Ip) and the negative virtual machine current (In), a first final current command
(
I
1
*
)
and a second final current command
(
I
2
*
)
;
command, based on the first final current command
(
I
1
*
)
,
the first power converter to apply the first DC output voltage to the first winding set and thereby causing a first output current to be generated in the winding set in accordance with the first final current command
(
I
1
*
)
;
and
command, based on the second final current command
(
I
2
*
)
,
the second power converter to apply the second DC output voltage to the second winding set and thereby causing a second output current to be generated in the second winding set in accordance with the second final current command
(
I
2
*
)
.

55 more elements

Dependencies are inferred from the claim text.

Facts

Application: 19/069,680Filed 4 Mar 2025
Published: 10 Sep 2026
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

H02P 29/028
Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load: the motor continuing operation despite the fault…
B62D 5/0403
Electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear: characterised by constructional features, e.g.…
B62D 5/0463
Controlling the motor: calculating assisting torque from the motor based on driver input
H02P 21/22
Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation: current control, e.g. using…